TS-453A hangs on reboot/booting status after soft reboot in QTS 4.x and 5.x

QNAP TS-453A
BIOS: QX47AR12
EC: QX47EC24
Problem: TS-453A hangs on reboot/booting status after soft reboot in QTS 4.x and 5.x

New phenomenon or was that always the case?

Could you let us know how often the boot process gets stuck, and under what circumstances it happens? Also, if you remove all the drives completely, is the NAS able to boot up normally? Thank you!

sounds like the same old bios issue: